Mobile communication system
First Claim
1. A mobile communication system for radio communication comprising:
- a plurality of communication stations including a plurality of mobile stations and at least one base station, wherein mobile communication is performed between the stations with a communication signal using a predetermined access method selected from a plurality of frequency sharing or time sharing multiple access methods available to said communication system, wherein each of said communication stations includes;
a receiving unit for receiving a communication signal, said communication signal includinga TDMA signal identified by a synchronization word code, said TDMA signal transmitted between two stations having a different synchronization word code from other TDMA signals assigned to the same frequency and time slot, based on a TDMA method anda time divided CDMA signal, frequency spread by a spread code and being assigned to a time division time slot, based on a CDMA method;
a shared signal regeneration unit for regenerating the time divided CDMA signal from the received communication signal and for outputting said time divided CDMA signal as a shared signal;
a shared signal removing unit for removing the shared signal from the received communication signal; and
a desired signal regeneration unit for regenerating said TDMA signal after removal of the shared signal from the received communication signal and for outputting said TDMA signal as a desired signal.
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Accused Products
Abstract
A mobile communication system implementing a frequency sharing and a time slot sharing using communication signal including a plurality of TDMA signals and/or the time divided CDMA signals, to supply the mobile communication system with an improved overall communication quality. The system includes the communication signal from a plurality of multiple access method for sharing frequency and time. A TDMA signal identified by synchronization word code has a different synchronization word code from each other, which is assigned to the same frequency and time slot. A time divided CDMA signal is frequency spreaded by spreading codes which is assigned to time divided time slot. The system also includes the stations which regenerate the time divided CDMA shared signal from the received communication signal and after a removal of the shared signal from the communication signal the TDMA signal synchronization word code is regenerated as desired signal.
62 Citations
18 Claims
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1. A mobile communication system for radio communication comprising:
a plurality of communication stations including a plurality of mobile stations and at least one base station, wherein mobile communication is performed between the stations with a communication signal using a predetermined access method selected from a plurality of frequency sharing or time sharing multiple access methods available to said communication system, wherein each of said communication stations includes; a receiving unit for receiving a communication signal, said communication signal including a TDMA signal identified by a synchronization word code, said TDMA signal transmitted between two stations having a different synchronization word code from other TDMA signals assigned to the same frequency and time slot, based on a TDMA method and a time divided CDMA signal, frequency spread by a spread code and being assigned to a time division time slot, based on a CDMA method; a shared signal regeneration unit for regenerating the time divided CDMA signal from the received communication signal and for outputting said time divided CDMA signal as a shared signal; a shared signal removing unit for removing the shared signal from the received communication signal; and a desired signal regeneration unit for regenerating said TDMA signal after removal of the shared signal from the received communication signal and for outputting said TDMA signal as a desired signal.
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2. A mobile communication system for radio communication comprising:
a plurality of communication stations including a plurality of mobile stations and at least one base station, wherein mobile communication is performed between the stations with a communication signal using a predetermined access method from a plurality of frequency sharing or time sharing multiple access methods available to said communication system, wherein each of said communication stations includes; a receiving unit for receiving a communication signal, said communication signal including a TDMA signal identified by a synchronization word code, said TDMA signal transmitted between two stations having a different synchronization word code from other TDMA signals assigned to the same frequency and time slot, based on a TDMA method, and a time divided CDMA signal, frequency spread by a spread code and being assigned to a time division time slot, based on a CDMA method; a shared signal regeneration unit for regenerating the TDMA signal from the receive communication signal and for outputting said TDMA signal as a shared signal; a shared signal removing unit for removing the shared signal from the received communication signal; and a desired signal regeneration unit for regenerating said time divided CDMA signal after removal of the shared signal from the received communication signal and for outputting said time divided CDMA signal as a desired signal.
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3. A mobile communication system for radio communication comprising:
a plurality of communication stations including a plurality of mobile stations and at least one base station, wherein mobile communication is performed between the stations with a communication signal using a predetermined access method from a plurality of frequency sharing or time sharing multiple access methods available to said communication system, wherein each of said communication stations includes; a receiving unit for receiving a communication signal said communication signal including a TDMA signal identified by a synchronization word code, said TDMA signal transmitted between two stations having a different synchronization word code from other TDMA signals assigned to the same frequency and time slot, based on a TDMA method, and a time divided CDMA signal, frequency spread by a spread code and being assigned to a time division time slot, based on a CDMA method; a base station control data memory unit for storing information for identifying said predetermined access method as control data showing a spreading code used in creating the time divided CDMA signal and a synchronization word code used in the TDMA signal, for the communication signal used within the service area of said a least one base station; and a base station access method control unit for controlling multiple access methods between a plurality of mobile stations an said at least one base station, based on said control data. - View Dependent Claims (4, 5, 6, 7, 8, 10)
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9. A mobile communication system for radio communication comprising:
a plurality of communication stations including a plurality of mobile stations and at least one base station, wherein mobile communication is performed between the stations with a communication signal using a predetermined access method from a plurality of frequency sharing or time sharing multiple access methods available to said communication system, wherein each of said communication stations includes; a receiving unit for receiving a communication signal, said communication signal including a TDMA signal identified by a synchronization word code, said TDMA signal transmitted between two stations having a different synchronization word code from other TDMA signals assigned to the same frequency and time slot, based on a TDMA method, and a time divided CDMA signal, frequency spread by a spread code and being assigned to a time division time slot, based on a CDMA method; a mobile switching center, connected to said at least one base station, for controlling the multiple access methods use in the mobile communication system, wherein the mobile switching center includes; a system control data memory unit for storing information for identifying said predetermined access method as control data showing a spreading code used in creating the time divided CDMA signal and a synchronization word code used in the TDMA signal, for the communication signal used within the mobile communication system; and a system access method control unit for controlling multiple access methods between a plurality of mobile stations and said a least one base station within the mobile communication system, based on the control data. - View Dependent Claims (11)
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12. A mobile communication system for radio communication comprising:
a plurality of communication stations including a plurality of mobile stations and at least one base station, wherein mobile communication is performed between the stations with a communication signal using a predetermined access method selected from a plurality of frequency sharing or time sharing multiple access methods available to said communication system, wherein each of said communication stations includes; a receiving unit for receiving a communication signal, said communication signal including a TDMA signal identified by a synchronization word code, said TDMA signal transmitted between two stations having a different synchronization word code from other TDMA signals assigned to the same frequency and time slot, based on a TDMA method, and wherein the mobile stations perform communication with said at least one base station using said TDMA signal, and perform communication with an adjoining base station using a TDMA signal identified by a synchronization word code that has a different synchronization word code from the previously used TDMA signal, upon handoff of communication from said at least one base station to said adjoining base station.
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13. A mobile communication system for radio communication comprising:
a plurality of communication stations including a plurality of mobile stations and at least one base station, wherein mobile communication is performed between the stations with a communication signal using a predetermined access method selected from a plurality of frequency sharing or time sharing multiple access methods available to said communication system, wherein each of said communication stations includes; a receiving unit for receiving a communication signal, said communication signal including a TDMA signal identified by a synchronization word code, said TDMA signal transmitted between two stations having a different synchronization word code from other TDMA signals assigned to the same frequency and time slot, based on a TDMA method, and a time divided CDMA signal, frequency spread by a spread code and being assigned to a time division time slot, based on a CDMA method; wherein the base station divides radio coverage of mobile communications into a plurality of concentric zones centered around the base station, wherein each of the concentric zones correspond to at least a time slot associated with one of;
a TDMA signal, a TDMA signal identified by a synchronization word code, and a time divided CDMA signal, andwherein, when a mobile station situated inside the concentric zones of radio coverage and assigned a time divided communication signal having a time slot corresponding to a particular concentric zone moves to another concentric zone, the mobile station is assigned a time divided communication signal having a time slot corresponding to said another concentric zone. - View Dependent Claims (14, 15, 16, 17)
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18. A mobile communication method for radio communication among a plurality of communication stations including a plurality of mobile stations and at least one base station, wherein mobile communication is performed between the stations with a communication signal using a predetermined access method selected from a plurality of frequency sharing or time sharing multiple access methods available to said communication system, the method comprising steps of:
receiving a communication signal including a TDMA signal identified by a synchronization word code, said TDMA signal transmitted between two stations having a different synchronization word code from other TDMA signals assigned to the same frequency and time slot, based on a TDMA method, and a time divided CDMA signal, frequency spread by a spread code and being assigned to a time division time slot, based on a CDMA method; regenerating one of the time divided CDMA signal and the TDMA signal from the receive communication signal and for outputting the regenerated signal as a shared signal; removing the shared signal from the communication signal; and regenerating the other of the TDMA signal and the time divided CDMA signal as a desired signal after removal of the shared signal from the communication signal and for outputting the desired signal.
Specification